摘要
介绍了插入式∑-△A／DC调制器的设计过程,并给出了调制器行为级SIMULINK模型,通过对调制器系统级仿真可以确定调制器的信噪比、增益因子等参数,为其电路设计提供依据。设计了一个4阶调制器,仿真结果显示在128的过采样比、输入信号相对幅度-6 dB的条件下,可获得110 dB的信噪比,达到18 bit的分辨率。
Method for designing an interpolative sigma - delta modulator was presented, and modulator behavioral modeling based on SIMULINK was introduced. System level simulation of modulator can acquire SNR, GAIN coefficient, which are useful to circuit design. 4-order modulator was designed, simulation results show that with the oversampling ratio selected 128 and relative magnitude of input - 6dB, the modulator achieves SNR of 110dB, the resolution power is 18bit.
出处
《半导体技术》
CAS
CSCD
北大核心
2007年第2期147-149,166,共4页
Semiconductor Technology
基金
国家863课题项目(2003AA116060)
关键词
∑-△调制器
过采样
仿真
sigma-delta modulator
oversampling
simulation
